I got my new 965 on 2nd Jan, as an upgrade from my old Fenix 5+. I've been using various Garmins with chest strap HRMs for 20 years, and I had hoped that the wrist HRM on the 965 might be reliable for use during running activities (the Fenix WHRM was awful, mainly I think due to its significant weight causing it to bounce about on the wrist).
My first 2 activities with the 965 were an outdoor run and an indoor cycle. I used the WHRM for both of these and was happy with the results.
My 965 then received a firmware update on 4th Jan. Since then, the WHRM has been awful, due to "cadence lock" I believe. I've reverted to using a chest strap again as a result.
For example, during today's indoor cycle (which I recorded on my Edge 840) my chest strap was recording the expected HR of around 150, and each time I glanced at the 965 during the activity it was showing a HR of around 90, which correlated almost precisely to my pedalling cadence. This was quite a surprise as running HR cadence lock stems from relatively forceful footfall transmitting mechanically to the watch on the wrist, whereas pedalling cadence results in a much more subtle mechanical transmission to the wrist.
Has anyone else noticed anything similar, especially in the newest firmware versions?
For reference, I always ensure that the watch strap is very snug before starting an activity, so the relatively lightweight 965 should not be bouncing around on my wrist.
